Vehicle transport apparatus

ABSTRACT

A vehicle transport apparatus is formed by a first robot and a second robot that enter underneath a vehicle, lift up wheels of the vehicle, and travel. The first robot and the second robot each include omnidirectional wheels and each further include a right lifting arm and a left lifting arm that are freely rotatably movable between storage positions (right storage position and left storage position) where tips thereof are pointed toward a center of a body in a width direction and expanded positions (right expanded position and left expanded position) where the tips thereof are pointed toward the outside of the body in the width direction.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2019-034651 filed on Feb. 27, 2019, the contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a vehicle transport apparatus for transporting a vehicle within a prescribed region.

Description of the Related Art

Japanese Laid-Open Patent Publication No. 08-028085 discloses an apparatus that loads a vehicle onto a pallet and transports the vehicle within a multistory parking lot in which pieces of equipment such as rails and pallets are provided.

SUMMARY OF THE INVENTION

A vehicle transport apparatus, which is different than the transport apparatus serving as the equipment described in Japanese Laid-Open Patent Publication No. 08-028085 and that can travel within the vehicle transport region (parking lot, cargo ship, harbor, or the like) has been developed. There is a desire that such a vehicle transport apparatus be made smaller and be capable of travelling freely within the vehicle transport region.

The present invention takes the above problems into consideration, and it is an object of the present invention to provide a small vehicle transport apparatus that can travel freely within a prescribed region.

The present invention is a vehicle transport apparatus that transports a vehicle by lifting up wheels of the vehicle, including a first robot configured to enter underneath the vehicle, lift up front wheels of the vehicle, and travel; and a second robot configured to enter underneath the vehicle, lift up rear wheels of the vehicle, and travel, wherein the first robot and the second robot each include omnidirectional wheels configured to cause a body to freely travel and turn omnidirectionally, by operating in cooperation with each other; a drive force transmitting mechanism configured to transmit a drive force to the omnidirectional wheels; a right contact portion configured to contact a contact surface on one of a front side and a back side of one wheel of the wheels; a right lifting arm configured to be freely rotationally movable between a right storage position at which a tip thereof points toward a center of the body in a width direction and a right expanded position at which the tip points toward a right side of the body in the width direction, and lift up the one wheel by drawing near the right contact portion while in contact with a contact surface on the other of the front side and the back side of the one wheel at the right expanded position; a left contact portion configured to contact a contact surface on one of a front side and a back side of the other wheel; a left lifting arm configured to be freely rotationally movable between a left storage position at which a tip thereof points toward the center of the body in the width direction and a left expanded position at which the tip points toward a left side of the body in the width direction, and lift up the other wheel by drawing near the left contact portion while in contact with a contact surface on the other of the front side and the back side of the other wheel at the left expanded position; a right rotational force transmitting mechanism configured to transmit a rotational force to the right lifting arm; and a left rotational force transmitting mechanism configured to transmit a rotational force to the left lifting arm.

According to the present embodiment, the apparatus can be made smaller and can also move freely within the prescribed region.

The above and other objects features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which preferred embodiments of the present invention are shown by way of illustrative example.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B are each a schematic view of a vehicle transport apparatus that transports a vehicle;

FIG. 2 is a perspective view of a transport robot with the upper cover removed;

FIG. 3 is a top view of the transport robot with the upper cover removed;

FIG. 4 shows a block configuration of a control system and a power system of the transport robot;

FIG. 5 is a schematic view of the transport robot at a stage of aligning with the vehicle;

FIGS. 6A and 6B are each a schematic view of the transport robot before lifting up the wheels;

FIGS. 7A and 7B are each a schematic view of the transport robot after lifting up the wheels;

FIG. 8 shows a system configuration of a vehicle transport system;

FIG. 9 is a schematic view of a parking list;

FIG. 10 is a schematic view of a charging reservation list;

FIG. 11 is a sequence diagram showing an entry process in which the vehicle enters a charging spot;

FIG. 12 is a sequence diagram showing a transport-in process in which the vehicle is transported into a charging space;

FIG. 13 is a sequence diagram showing a transport-out process in which the vehicle is transported out from the charging space; and

FIG. 14 is a sequence diagram showing an exit process in which the vehicle exits the charging spot.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following describes in detail preferred embodiments of a vehicle transport apparatus according to the present invention, while referencing the accompanying drawings.

[1. Vehicle Transport Apparatus 10]

As shown in FIGS. 1A and 1B, the vehicle transport apparatus 10 includes a set of transport robots 12 (first robot 12 a and second robot 12 b) that can travel autonomously within a prescribed region where transport of a vehicle 94 is required. The first robot 12 a can enter underneath the vehicle 94, lift up front wheels 96 f of the vehicle 94, and move autonomously within the prescribed region. The second robot 12 b can enter underneath the vehicle 94, lift up rear wheels 96 r of the vehicle 94, and travel autonomously within the prescribed region. The first robot 12 a and the second robot 12 b have the same structure. However, the first robot 12 a is a master device, and the second robot 12 b is a slave device.

[1.1. Structure of the Transport Robots 12]

The following describes the structure of a transport robot 12 (first robot 12 a or second robot 12 b), using FIGS. 2 and 3. FIGS. 2 and 3 show the transport robot 12 in a state where an upper cover 14 (see FIG. 1A) that covers the top portion of the body 16 is removed. In this specification, in order to aid the description, each direction used as a reference for the transport robot 12 is defined as shown below. A direction in which a right contact portion 48R and a left contact portion 48L are arranged relative to a right lifting arm 42R and a left lifting arm 42L, which are described further below, is a forward direction, and the opposite of this direction is a backward direction. Furthermore, in this specification, a direction in which a right load-bearing mechanism 30R, which is described further below, is arranged relative to a center position (referred to below as the center line C) in a width direction of the transport robot 12 is the right direction, and the direction in which a left load-bearing mechanism 30L, which is described further below, is arranged relative to the center line C is the left direction. In the following description, unless otherwise specified, forward, backward, right, and left refer to the forward, backward, right, and left directions of the transport robot 12.

The transport robot 12 basically includes the body 16, four sets of drive mechanisms 20 arranged inside the body 16, the right load-bearing mechanism 30R arranged on the right side of the body 16, and the left load-bearing mechanism 30L arranged on the left side of the body 16. The right load-bearing mechanism 30R is arranged on the right side of the transport robot 12. The left load-bearing mechanism 30L is arranged on the left side of the transport robot 12. The four sets of drive mechanisms 20 are arranged in the center of the transport robot 12 between the right load-bearing mechanism 30R and the left load-bearing mechanism 30L. The body 16 is a frame that forms the transport robot 12 and supports each component.

The first set of drive mechanisms 20 includes a drive force transmitting mechanism 22 and an omnidirectional wheel 28. The drive force transmitting mechanism 22 includes a travel motor 24 and a drive-side reduction gear (speed reducer) 26. The four sets of drive mechanisms 20 are separated into two groups, which are arranged respectively on the left and right of the center line C. The two sets of drive mechanisms 20 on the left side and the two sets of drive mechanisms 20 on the right side are arranged to be linearly symmetric, with the center line C as the axis. Furthermore, the two sets of drive mechanisms 20 on the front side and the two sets of drive mechanisms 20 on the rear side are arranged to be linearly symmetric, with a line (not shown in the drawings) parallel to the width direction of the transport robot 12 as the axis. The travel motor 24, the drive-side reduction gear 26, and the omnidirectional wheel 28 in each set are arranged in the stated order from the center line C toward the outside in the width direction. Furthermore, the travel motor 24, the drive-side reduction gear 26, and the omnidirectional wheel 28 in each set are arranged such that the axes thereof coincide with each other.

The travel motor 24 is an electric motor. An output shaft of the travel motor 24 is connected to an input shaft of the drive-side reduction gear 26. The drive-side reduction gear 26 includes the input shaft and an output shaft on the same line, and includes a planetary gear reducer, for example. The output shaft of the drive-side reduction gear 26 is connected to the omnidirectional wheel 28.

The omnidirectional wheel 28 is a Mecanum wheel. The Mecanum wheel provided to each set can move the body 16 omnidirectionally (in a holonomic manner with 2 degrees of freedom in a plane) by operating in cooperation with each other to drive the body 16. Each drive mechanism 20 in the present embodiment includes a Mecanum wheel, but may instead include another type of wheel capable of omnidirectional driving. For example, each drive mechanism 20 may include an Omni wheel instead of the Mecanum wheel. Since the body 16 can travel omnidirectionally and turn freely if three Omni wheels are included, it is only necessary to provide three sets of drive mechanisms 20. The transport robot 12 may include an auxiliary wheel along with the omnidirectional wheels 28, in order to stabilize the orientation in the horizontal direction.

The right load-bearing mechanism 30R includes the right rotational force transmitting mechanism 32R, the right lifting arm 42R, and the right contact portion 48R. The left load-bearing mechanism 30L includes the left rotational force transmitting mechanism 32L, the left lifting arm 42L, and the left contact portion 48L. The right load-bearing mechanism 30R and the left load-bearing mechanism 30L are arranged to be linearly symmetrical, with the center line C as the axis. The right rotational force transmitting mechanism 32R and the left rotational force transmitting mechanism 32L each include a loading motor 34, a brake 36, a loading-side speed reducer 38, and a link member 40. The loading motor 34, the brake 36, the loading-side speed reducer 38, and the link member 40 are arranged in the stated order in a direction toward the rear of the transport robot 12. The link member 40 is arranged at the rear end of the transport robot 12. Since the right load-bearing mechanism 30R and the left load-bearing mechanism 30L have the same structure, the following describes only the right load-bearing mechanism 30R. The description of the right load-bearing mechanism 30R can also be applied to the left load-bearing mechanism 30L, by switching the term “right” for “left” and switching “R” for “L” in the reference numerals.

The loading motor 34 is an electric motor. The output shaft of the loading motor 34 is connected to the input shaft of the brake 36. The brake 36 is an electromagnetic brake, for example. The output shaft of the brake 36 is connected to the input shaft of the loading-side speed reducer 38. The loading-side speed reducer 38 has the input shaft and the output shaft that are orthogonal to each other, and it is a bevel gear, for example. The output shaft of the loading-side speed reducer 38 is connected to the link member 40. This output shaft is parallel to the up-down direction. The link member 40 includes a top plate part and a bottom plate part that are parallel to the front-rear direction and the width direction, and a side plate part that is connected to an end portion of the top plate part and an end portion of the bottom plate part and is parallel to the up-down direction. The top plate part is connected to the output shaft of the loading-side speed reducer 38, and the bottom plate part is connected to the body 16 in a rotatable manner.

The right lifting arm 42R is a rotating rod that includes a shaft member that is parallel to the front-rear direction and the width direction and a cylindrical member that is concentric with the shaft member and rotatable centered on the shaft member. A base portion 44R of the shaft member of the right lifting arm 42R is connected to the side plate part of the link member 40. The right lifting arm 42R moves rotationally between a right storage position 76R where a tip 46R points at the center of the body 16 in the width direction and a right expanded position 78R where the tip 46R points at the outside of the body 16 in the width direction (the right direction), in accordance with the rotational operation of the link member 40.

The right storage position 76R and the right expanded position 78R are positions where the shaft member of the right lifting arm 42R is parallel to the width direction. In other words, the right storage position 76R is the position of the right lifting arm 42R after the right lifting arm 42R has been rotated 180 degrees from the right expanded position 78R in a plane parallel to the front-rear direction and the width direction. On the other hand, the right expanded position 78R is the position of the right lifting arm 42R after the right lifting arm 42R has been rotated 180 degrees from the right storage position 76R in the plane parallel to the front-rear direction and the width direction.

The right contact portion 48R is a rotating rod that includes a shaft member extending from the body 16 toward the outside in the width direction and a cylindrical member that is concentric with the shaft member and rotatable centered on the shaft member. Both ends of the shaft member of the right contact portion 48R are fixed to the body 16. The shaft member is arranged on an extension line of the axes of the two sets of drive mechanisms 20 on the front side.

The transport robot 12 can enter underneath the vehicle 94, lift up the vehicle 94, and travel underneath the vehicle 94. Therefore, the total height of the transport robot 12 is preferably as low as possible. The total height of the transport robot 12 is preferably less than 150 mm, more preferably less than 140 mm, and even more preferably less than 130 mm. According to safety regulations in Japan, the lower limit for the height of the vehicle 94 from the ground is determined to be 90 mm, and therefore the total height of the transport robot 12 is most preferably less than 90 mm.

[1.2. Configuration of the Control System and Power System of the Transport Robots 12]

The following describes the configuration of the control system and power system of a transport robot 12, using FIG. 4. A portion of the configuration shown in FIG. 4 is also shown in FIGS. 1A and 3. The transport robot 12 includes, as the control system, a sensor group 50, a communicating section 62, a robot computing section 64, a robot storage section 66, a motor driver 70, a power relay 72, and a DC/DC converter 74. The sensor group 50 includes a camera 52, a distance sensor (ranging sensor) 54, a limit switch 56, a Hall element 58, an encoder 59, a positioning section 60, and a line sensor 61.

The camera 52 captures an image of the surroundings of the transport robot 12. The distance sensor 54 is a PSD sensor, radar, LiDAR, LRF, TOF sensor, or the like, for example, and detects the distance to an object in the vicinity of the transport robot 12. A plurality of the cameras 52 and a plurality of the distance sensors 54 are provided, in order to detect targets in all directions of the transport robot 12. As shown in FIG. 1A, in the present embodiment, four sets of a camera 52 and a distance sensor 54 are attached to the upper cover 14. The attachment positions are a front right portion, a front left portion, a rear right portion, and a rear left portion of the upper cover 14. The number, arrangement, and orientation of the cameras 52 are suitably set according to the range in which the cameras 52 are capable of capturing images. Similarly, the number, arrangement, and orientation of the distance sensors 54 are suitably set according to the range in which the distance sensors 54 are to be capable of detection.

The limit switch 56 limits the movement range of the right lifting arm 42R and the left lifting arm 42L. One limit switch 56 is provided at each of a position in front of the right expanded position 78R, a position in front of the right storage position 76R, a position in front of a left expanded position 78L, and a position in front of a left storage position 76L. The Hall element 58 detects rotation speeds of the four travel motors 24 and the two loading motors 34. The Hall element 58 is provided to each motor. The encoder 59 detects the rotational angle of the omnidirectional wheel 28. The encoder 59 is provided on the shaft of the omnidirectional wheel 28. The positioning section 60 includes a GNSS module, an acceleration sensor, a gyro sensor, and the like, for example, and detects the position and orientation of the transport robot 12 using at least one of satellite navigation and inertial navigation. The line sensor 61 captures an image of the ground surfaces (floor surface) on which the transport robot 12 travels.

The communicating section 62 includes a communication apparatus and an antenna for performing wireless communication with an external communication device. The external communication device is a server 102 (see FIG. 8) described further below, for example, and is a communicating section 62 of another transport robot 12 forming a pair with the transport robot 12. The communicating section 62 includes a communication module that performs wireless communication, via a public network, with a communication module for performing close-range wireless communication or Near-Field Communication.

The robot computing section 64 is formed by a processor that includes a CPU, an MPU, and the like, for example. The robot computing section 64 realizes various functions by executing programs stored in the robot storage section 66. The robot storage section 66 is formed by a RAM, a ROM, and the like, for example. The robot storage section 66 stores various programs, various types of information used in the processes performed by the robot computing section 64, and map information of the region in which the transport robot 12 travels.

A motor driver 70 is provided individually for each of the four travel motors 24 and the two loading motors 34. The input side of each motor driver 70 is connected to the battery 68, and the output side of each motor driver 70 is connected to the corresponding travel motor 24 or loading motor 34. The motor driver 70 performs a transformation operation according to a control signal output from the robot computing section 64. The battery 68 is connected to the input side of the power relay 72, and the brake 36 is connected to the output side of the power relay 72. The power relay 72 switches between supplying and cutting off the power from the battery 68, according to an ON signal or an OFF signal output from the robot computing section 64. The input side of the DC/DC converter 74 is connected to the battery 68, and the output side of the DC/DC converter 74 is connected to each electronic device. The DC/DC converter 74 has the power from the battery 68 input thereto, drops this power to a certain voltage, and supplies the resulting power to the sensor group 50 and the robot computing section 64.

[1.3. Loading Operation of the Transport Robot 12]

Here, a description is provided of the loading operation of the first robot 12 a that lifts up front wheels 96 f, of the two robots that are the transport robots 12. Before lifting up a vehicle 94, the right lifting arm 42R is stored at the right storage position 76R and the left lifting arm 42L is stored at the left storage position 76L.

As shown in FIG. 5, the robot computing section 64 recognizes the orientation of the vehicle 94 to be transported based on the image information captured by the camera 52 and the information detected by the distance sensor 54, moves the first robot 12 a to a position in front of the vehicle 94, and causes the rear portion of the first robot 12 a to face the front portion of the vehicle 94. At this time, the robot computing section 64 may receive the image information from cameras (external cameras) that are not the cameras of the robot, to recognize the orientation of the vehicle 94 to be transported based on this image information. Furthermore, the robot computing section 64 recognizes the width of the vehicle 94 (vehicle width) and also recognizes the center position (center line Co) in the vehicle width direction, based on the image information. In order to align the center position (center line C) of the first robot 12 a in the width direction with the center position (center line Co) of the vehicle 94, the robot computing section 64 outputs a control signal to the motor driver 70 to drive each travel motor 24. At this time, each travel motor 24 operates cooperatively to move the first robot 12 a in the width direction (either right or left). After the positional alignment, the robot computing section 64 outputs a control signal to the motor driver 70 to drive each travel motor 24, in order to cause the first robot 12 a to move backward. At this time, each travel motor 24 operates cooperatively to move the first robot 12 a backward so that the first robot 12 a enters underneath the vehicle 94.

As shown in FIGS. 6A and 6B, when each of the right contact portion 48R and the left contact portion 48L contacts or comes close to (within several centimeters) the contact surface on the front side of each of the left and right front wheels 96 f, the robot computing section 64 outputs a control signal to the motor driver 70 to stop each travel motor 24. The robot computing section 64 recognizes that the right contact portion 48R and the left contact portion 48L have contacted or become close to the front wheels 96 f based on at least one of the image information captured by the camera 52 and the information detected by the distance sensor 54. Alternatively, the robot computing section 64 also can recognize that the right contact portion 48R and the left contact portion 48L have contacted the front wheels 96 f, based on the loads of the travel motors 24 (load>prescribed value). Yet further, before moving the first robot 12 a backward, the robot computing section 64 may calculate the distance between the right and left contact portions 48R, 48L and the front wheels 96 f based on the information detected by the distance sensor 54, and cause the first robot 12 a to move backward by this distance.

As shown in FIGS. 7A and 7B, the robot computing section 64 outputs a control signal to the motor driver 70 to cause the left and right loading motors 34 to operate. Since the operation of the right load-bearing mechanism 30R and the operation of the left load-bearing mechanism 30L are substantially the same, the following describes only the operation of the left load-bearing mechanism 30L. When the loading motor 34 of the left rotational force transmitting mechanism 32L operates, the left lifting arm 42L rotationally moves from the left storage position 76L to the left expanded position 78L and contacts the contact surface on the rear side of the front wheel 96 f. When the loading motor 34 continues to operate, the left lifting arm 42L draws near the left contact portion 48L while the cylindrical member rotates. When this happens, the front wheel 96 f on the left side is lifted up. When the loading motor 34 continues to operate, the left lifting arm 42L contacts the limit switch 56 at the position where the left lifting arm 42L has been rotated by 180 degrees, or 180 degrees plus or minus a few degrees, from the storage position. The robot computing section 64 detects the signal output from the limit switch 56, and outputs a control signal to the motor driver 70 to stop the loading motor 34. At the same time, the robot computing section 64 outputs a control signal to the power relay 72 to cause the brake 36 to operate.

When the first robot 12 a is to lower the front wheels 96 f, the robot computing section 64 causes the loading motor 34 to operate, thereby moving the left lifting arm 42L away from the left contact portion 48L. When this happens, the front wheel 96 f on the left side is lowered to the ground. When the loading motor 34 continues to operate, the left lifting arm 42L moves rotationally from the left expanded position 78L to the left storage position 76L. The left lifting arm 42L at the left storage position 76L contacts the limit switch 56. The robot computing section 64 detects the signal output from the limit switch 56, and outputs a control signal to the motor driver 70 to stop the loading motor 34.

The above is a description of the loading operation of the first robot 12 a. The loading operation of the second robot 12 b is the same. However, as shown in FIGS. 1A and 1B, in the present embodiment, the front, rear, left, and right directions of the first robot 12 a match the front, rear, left, and right directions of the vehicle 94, but the front, rear, left, and right directions of the second robot 12 b are the opposite of the front, rear, left, and right directions of the vehicle 94. Therefore, for the loading operation of the second robot 12 b, the front, rear, left, and right directions are the opposite of the front, rear, left, and right directions in the loading operation of the first robot 12 a described above.

It should be noted that the front and rear directions of the first robot 12 a and the second robot 12 b relative to the vehicle 94 are not particularly limited. The front and rear directions of the first robot 12 a may match the front and rear directions of the vehicle 94, or may be the opposite of these direction. Similarly, the front and rear directions of the second robot 12 b may match the front and rear directions of the vehicle 94, or may be the opposite of these direction.

The robot computing section 64 of the first robot 12 a and the robot computing section 64 of the second robot 12 b can perform the loading operation of the first robot 12 a and the loading operation of the second robot 12 b at the same timing, or at different timings. For example, the robot computing section 64 of the first robot 12 a may transmit a loading completion signal with the communicating section 62, after the loading operation is completed. In this case, the robot computing section 64 of the second robot 12 b starts the loading operation (lifting and lowering the rear wheels 96 r) upon receiving the loading completion signal with the communicating section 62. Alternatively, the loading operation of the first robot 12 a may start after the loading operation of the second robot 12 b has been completed. Furthermore, the robot computing section 64 may detect information indicating the weight distribution of the vehicle 94 and then determine the timing of the loading operation of the first robot 12 a and the timing of the loading operation of the second robot 12 b based on this detection result. The information indicating the weight distribution of the vehicle 94 may be transmitted from the vehicle 94, or may be transmitted from an external apparatus other than the vehicle 94.

[1.4. Travel Operation of the Transport Robots 12]

The robot computing section 64 of the first robot 12 a causes the first robot 12 a to travel along a travel route generated in advance, regardless of whether the vehicle 94 to be transported is present. The information of the travel route may be generated by the robot computing section 64 of the first robot 12 a, or may be generated by the external server 102 (see FIG. 8). The information of the travel route is generated by arranging positions through which the first robot 12 a is to travel (positions in the region), in order of time. The robot computing section 64 of the first robot 12 a performs travel control by comparing the generated travel route to the position detected by at least one of the sensor group 50 and an external camera. It should be noted that, while the first robot 12 a is travelling, the robot computing section 64 of the first robot 12 a adjusts the travel route such that the distance between the first robot 12 a and an obstacle is greater than or equal to a prescribed value, based on the image information captured by the camera 52 and the information detected by the distance sensor 54.

The robot computing section 64 of the first robot 12 a may cause the first robot 12 a to travel with a travel posture that is generated in advance. The first robot 12 a can freely adjust its travel posture by individually adjusting the drive amounts and drive directions of the omnidirectional wheels 28. The information of the travel posture may be generated by the robot computing section 64 of the first robot 12 a, or may be generated by the external server 102 (FIG. 8). The robot computing section 64 of the first robot 12 a performs posture control by comparing the generated travel posture to the posture detected by the positioning section 60. It should be noted that, while the first robot 12 a is travelling, the robot computing section 64 of the first robot 12 a adjusts the travel posture such that the distance between the first robot 12 a and an obstacle is greater than or equal to a prescribed value, based on the image information captured by the camera 52 and the information detected by the distance sensor 54.

The robot computing section 64 of the second robot 12 b causes the second robot 12 b to travel along the trajectory (travel trajectory) on which the first robot 12 a travelled. At this time, the robot computing section 64 of the second robot 12 b may acquire the information of the travel trajectory from the first robot 12 a via the communicating section 62, or may calculate the travel trajectory of the first robot 12 a based on the image information captured by the camera 52. In the same manner as in the first robot 12 a, the robot computing section 64 of the second robot 12 b adjusts the travel route (or the travel trajectory) such that the distance between the second robot 12 b and an obstacle is greater than or equal to a prescribed value, based on the image information captured by the camera 52 and the information detected by the distance sensor 54.

Furthermore, the robot computing section 64 of the second robot 12 b performs the travel control such that a certain space is maintained between the second robot 12 b and the first robot 12 a.

[2. Usage Example of the Vehicle Transport Apparatus 10]

The vehicle transport apparatus 10 can be used in a prescribed region where transport of a vehicle 94 is necessary, such as a parking lot, a charging spot 80, a cargo ship, or a port and harbor, for example. Here, a vehicle transport system 100 is described that uses the vehicle transport apparatus 10 at a charging spot 80.

[2.1. Charging Spot 80]

As shown in FIG. 8, the charging spot 80 serves as both a charging facility and a parking lot, and includes an entry space 82, an exit space 84, a parking space 86, a standby space 88, and a charging space 90.

The entry space 82 is the entrance to the charging spot 80, and is also a space where the vehicle transport apparatus 10 lifts up the vehicle 94. The exit space 84 is the exit from the charging spot 80, and is a space where the vehicle transport apparatus 10 lowers the vehicle 94. The parking space 86 is a space where the vehicle 94 parks when the user of the vehicle 94 wants to park. The standby space 88 is a space where the vehicle transport apparatus 10 is in standby, and includes equipment for non-contact charging of the transport robot 12. The charging space 90 is a space for charging the battery of a vehicle 94 that travels using an electric motor, such as an electric vehicle or a hybrid vehicle. In this specification, it is envisioned that equipment for non-contact charging is provided in the charging space 90, but equipment that performs contact charging may be provided instead. The parking space 86 and the charging space 90 are spaces for a single vehicle, and one or more of these spaces are provided at the charging spot 80.

[2.2. Configuration of the Vehicle Transport System 100]

The vehicle transport system 100 constructed at the charging spot 80 includes one or more vehicle transport apparatuses 10, the server 102, a vehicle sensor 108, a monitoring camera 110, and a charging apparatus 112.

The server 102 is a computer that includes a server computing section 104 and a server storage section 106. The server computing section 104 is formed by a processor including a CPU, an MPU, and the like. The server computing section 104 performs various functions by executing programs stored in the server storage section 106. The server storage section 106 is formed by a RAM, a ROM, and the like. The server storage section 106 stores various programs, various types of information used in the processes performed by the server computing section 104, map information of the inside of the charging spot 80, a parking list 120 (see FIG. 9), and a charging reservation list 130 (see FIG. 10).

As shown in FIG. 9, position information 122 indicating the number (serial number) and position of each parking space 86 and identification information 124 of a user that is to receive a parking service are stored in the parking list 120 in association with each other. The identification information 124 is information for identifying a vehicle 94 at the charging spot 80. Here, information indicating the contact information of a terminal apparatus 140 possessed by the user of the vehicle 94, a number set arbitrarily by the user, and the like are used as the identification information 124.

As shown in FIG. 10, reservation number information 132 indicating the order in which charging reservations were received, the identification information 124 of a user that is to receive a charging service, and a charging completion flag 134 indicating whether charging has been completed are stored in the charging reservation list 130 in association with each other. Battery charging is performed in the order in which charging reservations were received. Essentially, the reservation number information 132 indicates the charging order.

The description continues below while returning to FIG. 8. The server 102 transmits and receives information through wireless communication to and from the transport robot 12 and manages the actions of the transport robot 12. The server 102 performs wired or wireless communication with the charging apparatus 112, and manages the charging process. Furthermore, the server 102 performs wireless communication with the vehicle 94 that is stopped in the charging space 90, to monitor the charging state of the battery of the vehicle 94. Furthermore, the server 102 performs wired or wireless communication with the vehicle sensor 108 and the monitoring camera 110, to monitor whether a vehicle has entered the charging spot 80 and the parking state. Yet further, the server 102 performs communication with the terminal apparatus 140 possessed by the user of the vehicle 94, receives requests for charging from the user, and provides various notifications to the user, using close-range wireless communication or a public network.

A vehicle sensor 108 is provided to the parking space 86 and to the charging space 90. Upon detecting the vehicle 94 stopped in the corresponding parking space 86 or charging space 90, the vehicle sensor 108 transmits a detection signal to the server 102. The monitoring camera 110 is provided to the entry space 82. The monitoring camera 110 transmits image information obtained by capturing an image of the entry space 82 to the server 102. The charging apparatus 112 includes a power transmission coil 114 and a power supply apparatus 116. The power transmission coil 114 is arranged on the ground surface (floor surface) or below the ground surface (floor surface), facing a power reception coil of the vehicle 94. The power supply apparatus 116 supplies power to the power transmission coil 114.

The terminal apparatus 140 possessed by the user is a smartphone, a tablet, or the like, for example. The terminal apparatus 140 has a function of being able to perform communication using a public network or a function of being able to perform close-range wireless communication, such as Bluetooth (Registered Trademark). Software for using the charging spot 80 is installed in advance in the terminal apparatus 140.

[2.3. Each Process Performed by the Vehicle Transport System 100]

The following describes each process (entry process, transport-in process, transport-out process, and exit process) performed by the vehicle transport system 100.

[A. Entry Process of the Vehicle 94 Entering the Charging Spot 80]

The following describes the flow of the entry process in which the vehicle 94 enters the charging spot 80, using FIG. 11. A user who wants to enter the charging spot 80 with their vehicle applies for vehicle entry using the terminal apparatus 140, after stopping the vehicle 94 in the entry space 82.

At step S1, the terminal apparatus 140 transmits an entry request to the server 102. At this time, the terminal apparatus 140 transmits the identification information 124 (see FIG. 9) along with the request.

At step S2, the server computing section 104 checks the image information captured by the monitoring camera 110 in response to the entry request, and detects the vehicle 94. At step S3, the server computing section 104 refers to the parking list 120 (see FIG. 9) and assigns the vehicle 94 to an empty parking space 86. At step S4, the server computing section 104 generates the shortest travel route from the standby space 88 to the entry space 82 and the shortest travel route from the entry space 82 to the parking space 86. At this time, an optimal travel posture may be generated. At step S5, the server computing section 104 transmits route information indicating the generated travel routes and transport-in instructions to the first robot 12 a of the transport robots 12. When transmitting the travel route information, the server computing section 104 may also transmit the travel posture information. In the following, at any time when the vehicle 94 is not being transported, the server computing section 104 may generate and transmit the travel posture information in the same manner.

At step S6, the first robot 12 a and the second robot 12 b travel along the travel route and transport the vehicle 94 in. Specifically, the robot computing section 64 of the first robot 12 a refers to the travel route from the standby space 88 to the entry space 82 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the entry space 82, each robot computing section 64 lifts up the vehicle 94 (see section [1.3] above). When the loading operation is completed, the robot computing section 64 of the first robot 12 a refers to the travel route from the entry space 82 to the parking space 86 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the parking space 86, each robot computing section 64 lowers the vehicle 94 (see section [1.3] above). At step S7, the robot computing section 64 of the first robot 12 a transmits a transport-in completion notification to the server 102.

At step S8, the server computing section 104 transmits parking completion notification to the terminal apparatus 140 of the user, and also transmits the position information 122 of the parking space 86, e.g., the number of the parking space 86, to the terminal apparatus 140.

At step S9, the server computing section 104 updates the parking list 120 by associating the identification information 124 transmitted from the terminal apparatus 140 at step S1 with the position information 122 of the parking space 86 where the vehicle 94 parked. At step S10, the server computing section 104 generates the shortest travel route from the parking space 86 to the standby space 88. At step S11, the server computing section 104 transmits the route information indicating the generated travel route and return instructions to the first robot 12 a.

At step S12, the first robot 12 a and the second robot 12 b travel along the travel route. Specifically, the robot computing section 64 of the first robot 12 a refers to the travel route from the parking space 86 to the standby space 88 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). At step S13, when the first robot 12 a and the second robot 12 b arrive at the standby space 88, the robot computing section 64 of the first robot 12 a transmits a return notification to the server 102.

A user who wants to park at the charging spot 80 and also perform charging applies for the parking service and also applies for the charging service, using the terminal apparatus 140. In this case, at step S1, the terminal apparatus 140 transmits the charging request to the server 102.

Furthermore, at step S9, the server computing section 104 updates the charging reservation list 130 (see FIG. 10). Here, the server computing section 104 creates data in which the reservation number information 132 indicating the newest receipt number, the identification information 124 transmitted from the terminal apparatus 140 at step S1, and the charging completion flag 134 indicating that the charging is incomplete are associated with each other, and updates the charging reservation list 130.

[B. Transport-In Process for Transporting the Vehicle 94 into the Charging Space 90]

The following describes the flow of the transport-in process for transporting the vehicle 94 into the charging space 90, using FIG. 12. The server computing section 104 periodically judges whether a vehicle 94 is waiting to be charged, based on the charging completion flag 134 of the charging reservation list 130. If there is a vehicle 94 waiting to be charged, the following process is performed.

At step S21, the server computing section 104 confirms that no vehicle 94 is stopped in the charging space 90, based on the detection result of the vehicle sensor 108 provided to the charging space 90. At step S22, the server computing section 104 specifies the vehicle 94 to be charged next. Here, the server computing section 104 refers to the charging reservation list 130, selects a piece of data that has the lowest number for the reservation number information 132 and in which the charging completion flag 134 indicates that the charging is incomplete, and extracts the identification information 124 from this data. At step S23, the server computing section 104 specifies the parking position of the vehicle 94 to be charged next. Here, the server computing section 104 refers to the parking list 120, selects the data that includes the identification information 124 extracted at step S22, and specifies the parking space 86 in which the vehicle 94 is parked from the position information 122 of this data. At step S24, the server computing section 104 generates the shortest travel route from the standby space 88 to the parking space 86 and the shortest travel route from the parking space 86 to the charging space 90. At step S25, the server computing section 104 transmits the route information indicating the generated travel routes and the transport-in instructions to the first robot 12 a of the transport robots 12.

At step S26, the first robot 12 a and the second robot 12 b travel along the travel route, to transport the vehicle 94 in. Specifically, the robot computing section 64 of the first robot 12 a refers to the travel route from the standby space 88 to the parking space 86 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the parking space 86, each robot computing section 64 lifts up the vehicle 94 (see section [1.3] above). When the loading operation is completed, the robot computing section 64 of the first robot 12 a refers to the travel route from the parking space 86 to the charging space 90 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the charging space 90, each robot computing section 64 lowers the vehicle 94 (see section [1.3] above). At this time, the robot computing section 64 of the first robot 12 a checks and confirms the position of the power transmission coil 114, based on the image information captured by the camera 52, and determines the position where the vehicle 94 is to be lowered. At this time, the robot computing section 64 may check and confirm the power transmission coil 114 itself, or may check and confirm a prescribed reference position provided in the charging space 90 and calculate the position of the power transmission coil 114 relative to the reference position. At step S27, the robot computing section 64 of the first robot 12 a transmits the transport-in completion notification to the server 102.

At step S28, the server computing section 104 instructs the power supply apparatus 116 to start the supply of power.

The flow from step S29 to step S32 is substantially the same as the flow from step S10 to step S13 shown in FIG. 11. However, here, the travel route from the charging space 90 to the standby space 88 is generated.

[C. Transport-Out Process for Transporting the Vehicle 94 Out from the Charging Space 90]

The following describes the transport-out process for transporting the vehicle 94 out from the charging space 90, using FIG. 13. The ECU of the vehicle 94 monitors the state of charge during the charging of the battery.

At step S41, the ECU of the vehicle 94 transmits the state of charge information indicating the state of charge to the server 102. The state of charge information may be information indicating the charge amount of the battery, or may be information providing notification that the charge amount of the battery has reached a prescribed value.

At step S42, the server computing section 104 detects that the charging of the battery has ended (charge amount >prescribed value), based on the state of charge information. At step S43, the server computing section 104 instructs the power supply apparatus 116 to stop the supply of power. At step S44, the server computing section 104 generates the shortest travel route from the standby space 88 to the charging space 90 and the shortest travel route from the charging space 90 to the parking space 86 where the vehicle 94 was parked before the charging. At step S45, the server computing section 104 transmits the travel route information indicating the generated travel routes and the transport-out instructions to the first robot 12 a of the transport robots 12.

At step S46, the first robot 12 a and the second robot 12 b travel along the travel route, to transport the vehicle 94 out. Specifically, the robot computing section 64 of the first robot 12 a refers to the travel route from the standby space 88 to the charging space 90 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the charging space 90, each robot computing section 64 lifts up the vehicle 94 (see section [1.3] above. When the loading process is completed, the robot computing section 64 of the first robot 12 a refers to the travel route from the charging space 90 to the parking space 86 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the parking space 86, each robot computing section 64 lowers the vehicle 94 (see section [1.3] above). At step S47, the robot computing section 64 of the first robot 12 a transmits a transport-out completion notification to the server 102.

At step S48, the server computing section 104 transmits a charging end notification to the terminal apparatus 140 of the user.

The flow from step S49 to step S52 is the same as the flow from step S10 to step S13 shown in FIG. 11.

[D. Exit Process of the Vehicle 94 Exiting the Charging Spot 80]

The following describes the flow of the exit process in which the vehicle 94 exits the charging spot 80, using FIG. 14. A user who wants to exit from the charging spot 80 with their vehicle applies for exit using the terminal apparatus 140.

At step S61, the terminal apparatus 140 transmits an exit request to the server 102. At this time, the terminal apparatus 140 transmits the identification information 124 (see FIG. 9) along with the request.

At step S62, the server computing section 104 specifies the parking position (parking space 86) of the vehicle 94 that is to exit. Here, the server computing section 104 refers to the parking list 120 and specifies the parking position corresponding to the identification information 124 transmitted from the terminal apparatus 140 at step S61. At step S63, the server computing section 104 generates the shortest travel route from the standby space 88 to the parking space 86 and the shortest travel route from the parking space 86 to the exit space 84. At step S64, the server computing section 104 transmits the route information indicating the generated travel routes and the transport-out instructions to the first robot 12 a of the transport robots 12.

At step S65, the first robot 12 a and the second robot 12 b travel along the travel route, to transport the vehicle 94. Specifically, the robot computing section 64 of the first robot 12 a refers to the travel route from the standby space 88 to the parking space 86 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b arrive at the parking space 86, each robot computing section 64 lifts up the vehicle 94 (see section [1.3] above). When the loading operation is completed, the robot computing section 64 of the first robot 12 a refers to the travel route from the parking space 86 to the exit space 84 and performs travel control of the first robot 12 a and the second robot 12 b (see section [1.4] above). When the first robot 12 a and the second robot 12 b reach the exit space 84, each robot computing section 64 lowers the vehicle 94 (see section [1.3] above). At step S66, the robot computing section 64 of the first robot 12 a transmits a transport-out completion notification to the server 102.

At step S67, the server computing section 104 transmits an exit notification to the terminal apparatus 140 of the user.

The flow from step S68 to step S71 is the same as the flow from step S10 to step S13 shown in FIG. 11. However, here, the travel route from the exit space 84 to the standby space 88 is generated.

[3. Modifications and Other Additional Functions]

When the robot computing section 64 checks its own position and posture based on inertial navigation, it is preferable to adjust the position and posture of the robot computing section 64 checked at a prescribed timing or a certain timing. For example, the charging spot 80 (standby space 88 or the like) is provided with an indicator at a prescribed position, and this prescribed position is stored in each robot storage section 66. The robot computing section 64 adjusts its own position and posture checked at this point of time by using the prescribed position stored in the robot storage section 66 and a direction and distance of the indicator relative to the body 16 detected by the camera 52 and the distance sensor 54.

With the vehicle transport system 100 shown in FIG. 8, it is possible to provide maintenance information to the user of the vehicle 94 parked in the charging spot 80. For example, when the robot computing section 64 enters underneath the vehicle 94 or passes underneath the vehicle 94, an image of the bottom surface or the tires of the vehicle 94 is captured by the camera 52. Then, the robot computing section 64 associates the image information with the position information 122 and the identification information 124 of the vehicle 94. The robot computing section 64 analyzes the image information to detect scratches or the like on the bottom surface or to check the wear and damage of the tires. In a case where the left and right contact portions and lifting arms are provided with sheet-shaped pressure sensors, the robot computing section 64 judges whether the air pressure in the tires is insufficient, based on the detection results of the pressure sensors. The robot computing section 64 transmits these pieces of maintenance information to the terminal apparatus 140.

[4. Technical Concepts that Can Be Realized from the Embodiments]

The technical concepts that can be understood from the embodiments described above are described below.

An aspect of the present invention is a vehicle transport apparatus 10 that transports a vehicle 94 by lifting up wheels 96 of the vehicle 94, including:

-   -   a first robot 12 a configured to enter underneath the vehicle         94, lift up front wheels 96 f of the vehicle 94, and travel; and     -   a second robot 12 b configured to enter underneath the vehicle         94, lift up rear wheels 96 r of the vehicle 94, and travel,         wherein     -   the first robot 12 a and the second robot 12 b each include:         -   omnidirectional wheels 28 configured to cause a body 16 to             freely travel and turn omnidirectionally, by operating in             cooperation with each other;         -   a drive force transmitting mechanism 22 configured to             transmit a drive force to the omnidirectional wheels 28;         -   a right contact portion 48R configured to contact a contact             surface on one of a front side and a back side of one wheel             of the wheels 96 (the front wheels or the rear wheels);         -   a right lifting arm 42R configured to be freely rotationally             movable between a right storage position 76R at which a tip             46R thereof points toward a center of the body 16 in a width             direction and a right expanded position 78R at which the tip             46R points toward a right side of the body 16 in the width             direction, and lifts up the one wheel 96 by drawing near the             right contact portion 48R while in contact with a contact             surface on the other of the front side and the back side of             the one wheel 96 at the right expanded position 78R;         -   a left contact portion 48L configured to contact a contact             surface on one of a front side and a back side of the other             wheel 96;         -   a left lifting arm 42L configured to be freely rotationally             movable between a left storage position 76L at which a tip             46L thereof points toward the center of the body 16 in the             width direction and a left expanded position 78L at which             the tip 46L points toward a left side of the body 16 in the             width direction, and lifts up the other wheel 96 by drawing             near the left contact portion 48L while in contact with a             contact surface on the other of the front side and the back             side of the other wheel 96 at the left expanded position             78L;         -   a right rotational force transmitting mechanism 32R             configured to transmit a rotational force to the right             lifting arm 42R; and         -   a left rotational force transmitting mechanism 32L             configured to transmit a rotational force to the left             lifting arm 42L.

According to the above configuration, the vehicle transport apparatus 10 is divided into the first robot 12 a and the second robot 12 b, and therefore the overall apparatus is made smaller and can turn in a small space. Furthermore, according to the above configuration, the tips 46L and 46R of the left and right arms point toward the center in the width direction when at the storage positions and point toward the outside in the width direction when at the expanded positions, and therefore the lengths of the first robot 12 a and the second robot 12 b in the front-rear direction are shortened. As a result, there is no need for a wide region in which to store the first robot 12 a and the second robot 12 b.

Furthermore, according to the above configuration, the first robot 12 a and the second robot 12 b can enter underneath the vehicle 94. In other words, the first robot 12 a and the second robot 12 b can travel underneath the vehicle 94, and therefore the travel routes of the first robot 12 a and the second robot 12 b can be set in the parking position of the vehicle 94. As a result, the first robot 12 a and the second robot 12 b can move across the shortest distance toward the destination (parking position of the vehicle 94 to be transported or the like).

Furthermore, according to the above configuration, the first robot 12 a and the second robot 12 b include the omnidirectional wheels 28, and therefore the first robot 12 a and the second robot 12 b can move freely in all directions. Therefore, no matter what posture the vehicle 94 to be transported stops in, the first robot 12 a and the second robot 12 b can easily enter underneath the vehicle 94 and lift up the vehicle 94. Furthermore, even when the transport path or the parking space 86 is narrow, the first robot 12 a and the second robot 12 b can easily perform the travelling and loading.

In this aspect of the present invention,

the right rotational force transmitting mechanism 32R may rotate the right lifting arm 42R 180 degrees in a plane parallel to a ground surface, and

the left rotational force transmitting mechanism 32L may rotate the left lifting arm 42L 180 degrees in the plane parallel to the ground surface.

According to the above configuration, the lengths of the first robot 12 a and the second robot 12 b in the front-rear direction can be further shortened.

In this aspect of the present invention,

the right contact portion 48R may be shaped as a rod that is fixed to the body 16 and extends to the right side of the body 16 in the width direction, and

the left contact portion 48L may be shaped as a rod that is fixed to the body 16 and extends to the left side of the body 16 in the width direction.

According to the above configuration, the contact portions are fixed, and therefore the operation of lifting up the wheels 96 is stabilized.

In this aspect of the present invention,

the first robot 12 a may be a master device, and

the second robot 12 b may be a slave device.

According to the above configuration, the first robot 12 a and the second robot 12 b can easily perform cooperative operations. Furthermore, the computational load of the second robot 12 b is reduced.

In this aspect of the present invention,

operation timings of the right rotational force transmitting mechanism 32R and the left rotational force transmitting mechanism 32L of the first robot 12 a may differ from operation timings of the right rotational force transmitting mechanism 32R and the left rotational force transmitting mechanism 32L of the second robot 12 b.

In this aspect of the present invention,

a total height of the first robot 12 a and a total height of the second robot 12 b may each be less than 150 mm.

According to the above configuration, the first robot 12 a and the second robot 12 b can enter underneath the vehicle 94 that is at a height of at least 150 mm from the ground.

In this aspect of the present invention,

a drive mechanism 20 is formed by the omnidirectional wheels 28 and the drive force transmitting mechanism 22,

a right load-bearing mechanism 30R is formed by the right contact portion 48R, the right lifting arm 42R, and the right rotational force transmitting mechanism 32R,

a left load-bearing mechanism 30L is formed by the left contact portion 48L, the left lifting arm 42L, and the left rotational force transmitting mechanism 32L,

the right load-bearing mechanism 30R is arranged on the right side of the first robot 12 a and the second robot 12 b,

the left load-bearing mechanism 30L is arranged on the left side of the first robot 12 a and the second robot 12 b, and

the drive mechanism 20 is arranged between the right load-bearing mechanism 30R and the left load-bearing mechanism 30L.

According to the above configuration, the drive mechanism 20 is arranged between the right load-bearing mechanism 30R and the left load-bearing mechanism 30L, and therefore the lengths of the first robot 12 a and the second robot 12 b in the front-rear direction are shortened.

While the preferred embodiments of the present invention have been described above, the technical scope of the invention is not limited to the above described embodiments, and various configuration can be included in the technical scope of the invention. 

What is claimed is:
 1. A vehicle transport apparatus configured to transport a vehicle by lifting up wheels of the vehicle, comprising: a first robot configured to enter underneath the vehicle, lift up front wheels of the vehicle, and travel; and a second robot configured to enter underneath the vehicle, lift up rear wheels of the vehicle, and travel, wherein the first robot and the second robot each include: omnidirectional wheels configured to cause a body to freely travel and turn omnidirectionally, by operating in cooperation with each other; a drive force transmitting mechanism configured to transmit a drive force to the omnidirectional wheels; a right contact portion configured to contact a contact surface on one of a front side and a back side of one wheel of the wheels; a right lifting arm configured to be freely rotationally movable between a right storage position at which a tip thereof points toward a center of the body in a width direction and a right expanded position at which the tip points toward a right side of the body in the width direction, and lift up the one wheel by drawing near the right contact portion while in contact with a contact surface on another of the front side and the back side of the one wheel at the right expanded position; a left contact portion configured to contact a contact surface on one of a front side and a back side of another wheel of the wheels; a left lifting arm configured to be freely rotationally movable between a left storage position at which a tip thereof points toward the center of the body in the width direction and a left expanded position at which the tip points toward a left side of the body in the width direction, and lift up the other wheel by drawing near the left contact portion while in contact with a contact surface on another of the front side and the back side of the other wheel at the left expanded position; a right rotational force transmitting mechanism configured to transmit a rotational force to the right lifting arm; and a left rotational force transmitting mechanism configured to transmit a rotational force to the left lifting arm.
 2. The vehicle transport apparatus according to claim 1, wherein the right rotational force transmitting mechanism rotates the right lifting arm 180 degrees in a plane parallel to a ground surface, and the left rotational force transmitting mechanism rotates the left lifting arm 180 degrees in the plane parallel to the ground surface.
 3. The vehicle transport apparatus according to claim 1, wherein the right contact portion is shaped as a rod that is fixed to the body and extends to the right side of the body in the width direction, and the left contact portion is shaped as a rod that is fixed to the body and extends to the left side of the body in the width direction.
 4. The vehicle transport apparatus according to claim 1, wherein the first robot is a master device, and the second robot is a slave device.
 5. The vehicle transport apparatus according to claim 1, wherein operation timings of the right rotational force transmitting mechanism and the left rotational force transmitting mechanism of the first robot differ from operation timings of the right rotational force transmitting mechanism and the left rotational force transmitting mechanism of the second robot.
 6. The vehicle transport apparatus according to claim 1, wherein a total height of the first robot and a total height of the second robot are each less than 150 mm.
 7. The vehicle transport apparatus according to claim 1, wherein a drive mechanism is formed by the omnidirectional wheels and the drive force transmitting mechanism, a right load-bearing mechanism is formed by the right contact portion, the right lifting arm, and the right rotational force transmitting mechanism, a left load-bearing mechanism is formed by the left contact portion, the left lifting arm, and the left rotational force transmitting mechanism, the right load-bearing mechanism is arranged on a right side of the first robot and the second robot, the left load-bearing mechanism is arranged on a left side of the first robot and the second robot, and the drive mechanism is arranged between the right load-bearing mechanism and the left load-bearing mechanism. 